remove unnecessary bower tooling

[ericblade]

The world pretty much uses npm or yarn to install javascript modules, I don't think we need to continue supporting bower for that. I'm not yet sure if grunt is used in any way inside the project, or just as an alternative packaging/distribution method to npm. The commit here serratus/quaggaJS@05e6b46#diff-b9cfc7f2cdf78a7f4b91a753d10865a2 seems to include removal of bower/grunt, and unless someone has a good reason for us to keep it, i say we don't.

• edit: this task originally said grunt not bower. it looks like grunt is used in the build system presently, particularly to run "uglyasm" , though it might be simple to remove the dependency on grunt there too, i just haven't looked to see how that works